Definition of better verb from the Oxford Advanced American Dictionary

     

    better

     verb
    verb
    NAmE//ˈbɛt̮ər//
     
    Verb Forms present simple I / you / we / they better
     
    he / she / it betters
     
    past simple bettered
     
    -ing form bettering
     
     
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  1. 1[often passive] better something to be better or do something better than someone or something else The work he produced early in his career has never really been bettered.
  2. 2 better yourself to improve your social position through education, a better job, etc. Thousands of unemployed mothers are getting job training in an attempt to better themselves.
See the Oxford Advanced Learner's Dictionary entry: better